M size, Black Contains MOGU's unique fine powder beads, providing insulation and moisture-wicking/quick-drying properties. It was included in a Mogu lucky bag sold at Hands, but I'm selling it because I don't think I'll use it. Perhaps because it's a lucky bag, the packaging seems to be different from the usual one. The third image is for reference. New and unused, but has been opened for inspection. One piece (for one hand) May be compressed and folded for compact shipping. Anonymous shipping Quoting from the official website, etc.: Exceptional warmth! The soft fit of the highly elastic fabric and the insulation of the powder beads trap heat! The MOGU Warmer series for various body parts has arrived! The inside of the fabric is brushed, and the synergistic effect with the powder beads' insulation further enhances the warmth. A warm arm warmer that covers from the wrist to above the elbow. Product Name MOGU Arm Warmer 1 piece (BODY PARTS WARMER ARM WARMER) Inner Material Air Powder Beads (R) (Expanded Polystyrene) Outer Fabric Surface: 82% nylon, 18% polyurethane Lining: 85% polyester, 15% polyurethane, brushed material Size M size (upper arm circumference approx. 26-30cm) Color Black Specifications The inside of the fabric is brushed, and the synergistic effect with the powder beads' insulation further enhances the warmth. Unisex